Switchgear protections Archives

41. A transmission line is protected by

Inrush protection

Distance protection

Time graded and current graded over current protection

Both (B) and (C)

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42. Arc in a circuit behaves as

a capackive reactance

an inductive reactance

a resistance increasing with voltage rise across the arc

Detailed SolutionArc in a circuit behaves as

43. Distance relays are generally

split-phase relays

reactance relays

impedance relays

none of the above

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44. The material used for fuse must have

low melting point and high specific resistance

low melting point and -low specific resistance

high melting point and low specific resistance

low melting point and any specific resistance

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45. Insulation resistance of high voltage circuit breakers is more than

1 mega ohms

10 mega ohms

100 mega ohms

500 mega ohms

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46. The single phasing relays are used for the protection of

single phase motors only

two phase motors only

two single phase motors running in parallel

three phase motors

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47.

Load flow

Load flow and short-circuit

network analyzer is used to solve problems of A. Load flow B. Load flow and short-circuit C. Load flow and stability

Detailed Solution

48. A differential relay measures the vector difference between

two currents

two voltages

two or more similar electrical quantities

none of the above

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